Unidirectional valve for face mask



FIG. 1 is a perspective view of a unidirectional valve for face mask inaccordance with the present design;

FIG. 2 is a top view thereof;

FIG. 3 is a bottom view thereof; and,

FIG. 4 is a side view thereof.

The dash-dot-dash broken lines in the figures represent the boundariesof the claim design and form no part thereof. The dash-dash broken linesin the figures are for the purpose of illustrating portions of theunidirectional valve for face mask and form no part of the claimeddesign.

CLAIM We claim the ornamental design for a unidirectional valve for facemask, as shown and described.